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1) A magnet has north and south poles where magnetic forces are strongest. Magnetic field lines emerge from the north pole and enter the south pole. 2) Passing a current through a wire creates a circular magnetic field and induces magnetism. Increasing current or coiling the wire strengthens the magnetic field. 3) The motor effect produces a force on a current-carrying wire in a magnetic field at right angles to the field and current. This force causes electric motors to rotate.

Author

thaingocnhin

Language

EN